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Accumulated Other Comprehensive Income (Loss) (Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (178,254) $ (209,018) $ (178,254) $ (209,018) $ (208,719) $ (150,195)
Cost of goods sold 166,622 182,442 499,504 555,627    
Income (loss) before income taxes 9,379 (33,341) 24,602 (17,195)    
Income taxes from continuing operations (2,669) 3,382 1,864 9,064    
Net income (loss) 12,048 (36,723) 22,738 (26,259)    
Foreign Currency Translation            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (89,878) (111,892) (89,878) (111,892) (112,807) (47,270)
Gain (Loss) on Derivative Financial Instruments            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax 590 (1,140) 590 (1,140) (373) 656
Pension & Other Post-retirement Benefit Adjust.            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (88,966) (95,986) (88,966) (95,986) $ (95,539) $ (103,581)
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Income (loss) before income taxes (145) (1,323) (1,623) (1,821)    
Income taxes from continuing operations (53) (498) (600) (687)    
Net income (loss) (92) (825) (1,023) (1,134)    
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Aluminum Futures Contracts            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Cost of goods sold 160 1,338 1,669 1,867    
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Foreign Currency Forward Contracts            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Cost of goods sold 15 15 46 46    
Reclassification Out Of Accumulated Other Comprehensive Income | Pension & Other Post-retirement Benefit Adjust.            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Actuarial gain (loss) and prior service costs, before taxes (3,086) [1] (4,028) (9,759) (11,997)    
Income taxes from continuing operations (1,120) (1,478) (3,186) (4,402)    
Net income (loss) $ (1,966) $ (2,550) $ (6,573) $ (7,595)    
[1] (a)This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost (see Note 8 for additional detail).